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A biopsy specimen obtained from the lip demonstrated inflammatory cell infiltration. A: Hematoxylin and Eosin staining, ×400 magnification. B: Stained with IgG monoclonal antibody, ×400 magnification. C: Stained with IgG4 monoclonal antibody, ×400 magnification (more than 10 IgG4-positive plasma cells per HPF). HPF: high-power field
